Hi there,
we went on the Cityrama tour in 1999 and honestly will not do it again.
We were given headphones so you could listen to the guide in your own language and were driven around the town to show us the main places and just stopped at Notre Dame around 11.
We were given 2 hours to visit the cathedral and have something to eat and then back on the bus.
The same happened in the afernoon when we stopped at Eiffel Tour and were given two hours to visit it.
Funny enough they said if we would not had been back at 7 the bus would had not waited for anyone.
I didnt think it was worth the price and this time we are planning to get the RER and go on our own to visit Paris.
Mind you my younger son was 6 and moaned all the time he was bored and so on LOL